HYALOID Pool block New Improved formula.. is a flocculant and coagulant which will drop all the dust, algae spores and hair to the bottom of the pool...from Green to Clean in 3 days. Water PH 7 to 7.2 must be balanced.... Put HYALOID pool block into weir or pump basket and run pump for minimum 12 hours a day for the first 3 days.....thereafter for 8 hours a day...used in conjunction with chlorine...MAKE SURE YOU CHECK YOUR PH BALANCE..... Hyaloid pool block does not turn into slimy mass, and can... Read more